Improvement in book-looks



@uiten te'ts glatent @time HENRY R. GILLINGHAM, or BALTIMORE, MARYLAND,AssIeNoitTo HIMSELF, cHRIsro- PEER n. GILLLNGHAM, AND AMBRosE L.HUGGINs, 0E THE SAME PLACE.

Letters Patent No. 68,622, dated September 10, 1867.

IMPROVEMENT IN DOOR-LOCKS.

'lO ALL WHOM IT MAY CONCERN:

Be it known that I, HENRY RABORG GIILLINGHAM, of the city of Baltimore,county of Baltimore, and State of Maryland, have invented new and usefulImprovements in Door, Safe, or Pad-Locks and I do hereby declare thefollowing to be an exact description thereof, reference being had to theaccompanying drawings, and to the letters of reference marked thereon,making a part of this specification, in which- Figure 1 represents aninside view of the lock.

Figure 2, a longitudinal section.

Figure 3,- the inside spring levers.

Figure 4, the back side of the bolt, showing twoapertures.

Figure 5, the back plate, with the spring and pin that ts into theapertures at g. 4.

Figure 6, a cross-section.

Figures`7 and 8 represent the shape of the key.

The nature of my invention consists in the construction and arrangementoi the spring levers i'n the centrev of the bolt-plate, operating uponsmall upright tumblers that secure the bolt when locked or unlocked, thebolt containing the devices between and within its side plates, with adat spring attached to the back part lof the case of the lock that has apin that falls into two apertures in the back of the bolt-plate as anadditionalA security to hold the bolt when locked or unlocked. y

A represents the case orv outside plates of the lock, with the aperturesB for the. insertion of screws to fasten it together. C, a dat spring,riveted fast to case A, with a projecting pin, D, at its lower end, tofall into the apertures E E in the back of the bolt-plate H to hold thebolt F securely to its place when locked or unlocked. The bolt F issolid at its front end, but more than three-fourths of its length isformed of two plates, G and H, the front plate G having an angularrecess, J, for the ward of the key to catch in. The back plate Hoperates on the flat spring C, and as it slides 'back or forward the pinD falls into either aperture E to hold the bolt. L L are two levers,with springs M attached. The levers operate en a fulerum-pivot, N, and

' their points fit into upright tumblers P P, that operate verticallybymeans of the raising or lowering of the points of the levers L L as thelevers are acted upon by the 'wards of the key. These tumblers P P areheld between two projections or posts, R, that secure the bolt F when itis locked or unlocked. This lock has also two circular wards S S on eachplate A, with which the wards of the key correspond, .and whichnlikewise secure the lock against being picked or opened by burglars.

What I claim as my invention, and desire to secure by Letters Patent, is

The combination and arrangement of the vertical sliding tumblers P P,operated by the spring levers L L pivoted between the side bolt-plates Gand I-I, the latter being held and secured by the spring pin-D in. boththe locked and unlocked position of the bolt, substantially in themanner herein shown and described.

Y H. R. GILLINGI-IAM.

Witnesses:

J. FRANKLIN REIGART, JOHN S. HoLLINGsnEAD.

